is the result predictor ,predicts result is near around real rank ?? means my rank predicted 3213 to 3754 can I accept 3500 rank???

Result predictors are not highly accurate but you can assume plus or mknus 500 ranks from the rank you receive frequently. Atleast 90 percentile is must for getting into top colleges with premium Specialization. Apart from IIMs you stand fair chance at colleges like Spjain, FMS delhi, IIFT Delhi, MDI Gurgaon, IIM raipur and Udaiour, IIM Kashipur, Welingkars, Kj Somaiya, XIMB, TAPmI, IMT Ghaziabad, loyola Chennai, etc. With top 1000 ranks you have got good chances with top5 IIMs for GDPI rounds. All the Bsst.

Yes, it predict the near by rank from your actual rank. It is not accurate.